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(No Model.) 2 Sheets-Sheet 1. M.-I-I. SMITH. MOTOR FOR BLEGTRIG RAILWAYS.

Patented 31113 22, 1890.

c JHMQ M. QWJM vwamtoz (No Modl.) 2 Sheets-Sheet 2.

I M. E. SMITH. MOTOR FOR BLEGTRIG RAILWAYS.

No; 432,646. Patented July 22, 1890.

a wawtoz wow/mm 5 UNITED STATES PATENT OFFICE.

MICHAEL IIOLROYD SMITH, OF HALIFAX, COUNTY OF YORK, ENGLAND.

MOTOR FOR ELECTRIC RAILWAYS.

SPECIFICATION forming part of Letters Patent No. 432,646, dated July 22, 1890.

Application filed October 29, 1887. Serial No. 253,767. (No model.) Patented in England April 24:, 1886, No. 5,664; in Belgium November 11, 1886, No. 75,826; in France November 20, 1886, No. 179,785, and in Italy December 16, 1836, XX, 20,847.

To all whom it may concern:

Be it known that 1, MICHAEL HOLROYD SMITH, a subject of the Queen of Great Britain, and a resident of Halifax, in the county of York, England, have invented certain new and useful Improvements in Motors for Electric Railways, of which the following is a specificatiomfor which British Letters Patent, No. 5,66et, of April 24, 1886, French patent of November 20,1886, No. 179,785, Belgian patent of November 11. 1886, No. 75,326, and Italian patent of December 16, 1886, Vol.

XX, No. 20,8at7, have been granted to me.

This invention relates generally to the arrangement of dynamo-electric machines and their connected parts when employed for producing motive power, the invention being particularly applicable to the employment of electric motors for the propulsion of tram or railway cars, where the ends generally sought to be obtained are efficient and powerful motors within the smallest possible limits of space, together with such an arrangement and adjustment of the connected parts that the working of the whole may be reliable and not subject to derangement, undue strain, or friction owing to the varying movement of the car upon which it is carried.

The invention consists in the arrangement and combination of parts, as hereinafter indicated, by which the desired ends may be practically secured.

In order that my invention may be clearly understood, reference is made to the accompanyingdrawings,formiug part of the specification, and in which- Figure 1 represents in side elevation the platform of a car with the motor and con nected parts attached thereto. Fig. 2 represents a plan view of Fig. 1. Fig. 3 represents in side elevation the platform of a car with a motor of ordinary construction connected thereto in accordance with myinvention. Fig. 4 represents a plan view of Fig. 3. Fig. 5 represents partially in section an elevation of one of the driving-wheels with attached parts. Fig. 6 represents a section on the line 00 0c of Fig. 5. Fig. 7 represents an elevation of driving-gear when two worms are employed to drive the wheel. Fig. 8 represents in side elevation the flexible attachment between the plan of the same.

are used to designate like motor and wheel-frames. Fig. 9 represents a Fig. 10 represents partially in section the flexible coupling employed between the motor-spindle and driving-shaft. Fig. 11 represents a section of the same on the line y 3 Fig. 10. Fig. 12 repre sents an elevation of a double-armature motor. Fig. 13 represents the same when placed between and employed to drive two pairs of wheels, part being broken away. Fig. 14. represents in diagram at side elevation of the same. Fig. 15 represents a double-armature motor when placed external to but employed to drive two pairs of wheels.

In all the figures like letters of reference parts of the apparatus.

In order to occupy as little room as possible beneath the floor of the car, the electric motor is preferably made flat, and this may be done by arranging the magnets A A, yoke B, and armature-spindle O all in the same plane, as clearly shown in Figs. 1 and 2. \Vhen double magnet-motors'are used, the armature-spindle 0 passes through the frames 13' 13 as shown in Fig. 4, but when single magnet-motors are used, of the-kind represented in Figs. 1 and 2, the spindle C will pass through the yoke B, the other end being carried in a bracket a, of non-magnetic material secured to the fields of the magnets A A. hen the motor actuates one axle only, it is provided with studs or trunnions Z) Z), and by means of links (Z (Z is swung beneath the frame-work forming the flooring of the car. These links (Z (Z compensate for the varying relative position of the car and axle due to varying loads and the action of the springs. The yoke B or frameB at the end of the motor opposite to the commutator is provided with a swivel-bracket e e, the arms of which extend to a casing F, surrounding the gearing upon the axle. These arms 6 c are rigid vertically, but permit of horizontal movement either by being hinged, as shown in Figs. 1, 2, 8, and 9, or made of flexible metal plates, as shown in Figs. 3, 4, and 13. "Vhen the arms are hinged, they may be provided with a lug or projection c, which extends beyond the hinge or pivotal point, as shown in Fig. 9, and two springs ff bear against it upon opposite sides and also against the sides of the casing F, and thus assist in returning the yoke to its normal position when it has been forced to either side.

The gearing consists of a worm D and worm-wheel E. The surrounding casing F is preferably constructed of cast-iron and is formed in parts. The lower portion protects the bottom of the worm-wheel from dust and also forms an oil-box to catch and hold the oil. The top portion is formed in two longitudinal sections which are bolted together and carry the bearings g for the worm-shaft D. The end section carries the thrust-box G and forms an oil cup or reservoir. The wormshaft D may be turned from a single bar of steel, and the thrust-bearing preferably consists of an elliptical knob or an enlarged grooved end working in brasses g, adapted to receive the end-thrust, as clearly shown in Fig. 5.

The worm-shaft D and armature-spindle C are placed in the same line; but in order to provide for strains and twists they are connected by a flexible coupling consisting of a short shaft H between the worm-spindle D and armature-spindles O, as will be clearly seen 011 reference to Figs. 10 and 11, in which the short shaft II is shown as of cruciform shape in cross-section, the ends of. the projecting parts being slightly enlarged and rounded in all directions, so that they may move with but little friction in the box ends I, in which they are a loose fit. Said box en ds are bolted to the bosses J, which are attached to shafts C D, and may contain buffers h to prevent rattling of the parts; or, instead of this arrangement, any other suitable flexible m echanism may be employed.

In the construction shown in Fig. 14 the motor is carried on rubber or other springs or supports 7.: 7c, resting on brackets L, which run from the gear-casing F to supportingblocks Z Zon the next axle, the fit being a loose one, so as to permit of a certain amount of play and thus compensate for the various motions of the two axles. When a double armature R B, Fig. 12, is used, it may be located externally to the wheels and axles and the spindles O 0 extended, so that one armature will drive one axle and wheels, and the other armature drive the other axle and wheels, as shown in Fig. 15.

The construction described gives a virtually flexible armature-shaft, which, while effective in transmitting the driving-power, allows for any jolting or jumping of the car without imparting strain or undue friction to the various parts, its action, besides, being virtually noiseless.

It will be obvious that this arrangement of motor, flexible shaft, and easing may be employed for transmitting power for various other purposes.

Vhile I have thus described the general principles of my invention and shown how they may be applied, I do not limit myself to the precise construction and arrangement shown, as it is evident that my invention may be embodied in many and various forms, and parts thereof may be used alone or in connection with other equivalent devices.

What I claim is 1. The combination, with a car, of a motor, the magnets, yoke, and armature-spindle of which are all in the same plane, the motor being supported in swinging bearings beneath the car, substantially as described.

2. The combination, with a car, of an electric motor connected to drive the axle of the car, a casing upon the axle and flexibly connected with the yoke of the motor horizontally, but rigid vertically, the connections between the motor and axle being flexible, substantially as described.

3. The combination, with a car, of an electric motor pivotally supported on the car, a worm-gearing between the axle and motor, and flexible connections between the armature-shaft and worm-gearing, substantially as described. a

4. The combination, with a car, of an electric motor, the operative parts of which are arranged in a single plane, swinging connections between the motor and car, and flexible connections between the motor and axle, sub:

stantially as described.

5. The combination, with a car, of an electric motor for driving the car, gearing on the axle of the car, a casing for the gearing, a flexible coupling between the motor and gearing, and flexible attachments between the motor-yoke and easing of the gearing, substantially as described.

6. The combination, with a car and electric motor for driving the same, of a worm-gearing connecting the motor to the axle of the car, the said gearing being inclosed in a case forming an oil cup or receptacle and having a thrust-block connected to the casing against which the motorshaft bears, substantially as described.

7. The combination, with a car having two axles, of two armatures having common fieldmagnets, one of the armatures being flexibly connected to one axle of the car and the other armature being flexibly connected with the other axle, substantially as described.

8. The combination, with the shaft carrying a worm, a worm-gear, and thrust-block, of a case inclosing the same, the case being made in three parts, one inclosing the lower portion of the gear and forming an oil-box, and the others divided longitudinally and carrying the bearings for the worm and thrustblock, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

M. HOLROYD SMITH.

Witnesses:

F. L. FREEMAN, J. S. BARKER. 

